/**
 * Split a UTC interval at arbitrary `points`, producing consecutive sub-intervals.
 *
 * - `points` need not be sorted — they are sorted internally before splitting.
 * - Points outside `[start, end]` are dropped; they cannot introduce a boundary that isn't
 *   inside the interval.
 * - Points exactly on `start` or `end` are dropped too — they would only produce a
 *   zero-length sub-interval at the edge.
 * - Duplicate points collapse to a single boundary.
 * - Returns `[{ start, end }]` (the whole interval, unsplit) when no valid in-range point remains.
 * - Returns `[]` when `points` is not an array, when any element is not a valid ISO UTC
 *   datetime string, or on invalid input (unparseable start/end, `start > end`, leap-second
 *   strings).
 *
 * @param start ISO UTC datetime string for the interval start
 * @param end ISO UTC datetime string for the interval end
 * @param points array of ISO UTC datetime strings to split at
 * @returns array of `{ start, end }` records, or `[]` on invalid input
 *
 * @example intervalSplitAtUtc("2024-01-01T00:00:00Z", "2024-01-10T00:00:00Z", ["2024-01-05T00:00:00Z"]) // [{ start: "2024-01-01T00:00:00Z", end: "2024-01-05T00:00:00Z" }, { start: "2024-01-05T00:00:00Z", end: "2024-01-10T00:00:00Z" }]
 * @example intervalSplitAtUtc("2024-01-01T00:00:00Z", "2024-01-10T00:00:00Z", []) // [{ start: "2024-01-01T00:00:00Z", end: "2024-01-10T00:00:00Z" }]
 * @example intervalSplitAtUtc("invalid", "2024-01-10T00:00:00Z", ["2024-01-05T00:00:00Z"]) // []
 */
export declare function intervalSplitAtUtc(start: string, end: string, points: string[]): Array<{
    start: string;
    end: string;
}>;